Csdrhrt

I have an issue where I have multiple arrows which enter the same node, but they end up covering each other. How do I make one arrow enter the node at a different spot?

I'd like the yellow arrows to come in at a different angle but still go behind the circles

documentclass[tikz]{standalone}

usepackage{tikz}

usetikzlibrary{positioning, arrows.meta, decorations.shapes}



begin{document}



tikzset{decorate sep/.style 2 args={decorate,decoration={shape backgrounds,shape=circle,shape size=#1,shape sep=#2}}}



begin{tikzpicture}[

    font=sf scriptsize,

    >=LaTeX,

    cell/.style={

        rectangle, 

        sharp corners=5mm, 

        draw,

        thick,

        minimum width=1cm,

        minimum height=1cm,

        },

    roundThing/.style={

        circle,

        draw,

        inner sep=-0.5pt,

        minimum height=1cm,

        },

    ]



    coordinate(upLeft) at (-2, 1);

    node[roundThing](roundThing1){roundThing};



    node[roundThing, below= of roundThing1](roundThing2){roundThing};



    node[roundThing, below=of roundThing2](roundThing3){roundThing};



    node[cell, right=of roundThing2](square1){square1};



    node[cell] (square2) at (-1, -6) {square2};



    draw[decorate sep={0.5mm}{3mm},fill] (roundThing2) -- (roundThing3);



    draw[->, red] (square2) |- (roundThing1);

    draw[->, red] (square2) |- (roundThing2);

    draw[->, red] (square2) |- (roundThing3);



    draw[->, blue] (roundThing1) -- (square1);

    draw[->, blue] (roundThing2) -- (square1);

    draw[->, blue] (roundThing3) -- (square1);





    draw[yellow] (square1) |- (upLeft);

    draw[->, yellow] (upLeft) |- (roundThing1);

    draw[->, yellow] (upLeft) |- (roundThing2)[xshift=-1cm];

    draw[->, yellow] (upLeft) |- (roundThing3);

end{tikzpicture}

end{document}

like this?

documentclass[tikz, margin=3mm]{standalone}

usetikzlibrary{arrows.meta, positioning}



begin{document}

    begin{tikzpicture}[

            > = LaTeX,

node distance = 4mm and 8mm,

  base/.style = {draw, minimum size=10mm, font=sffamilyscriptsize},

  cell/.style = {base, thick},

roundThing/.style = {base,circle, inner sep=-0.5pt},

                        ]

node[roundThing] (rt1) {roundThing};

node[roundThing, below=of rt1] (rt2) {roundThing};

node[roundThing, below=of rt2] (rt3) {roundThing};

%

draw[dotted, very thick, shorten >=0.5mm, shorten <=0.5mm] (rt2) -- (rt3);

%

node[cell, right=of rt2] (square1) {square1};

node[cell, below left=of rt3.south] (square2) {square2};

%

coordinate[above left=of rt1] (upLeft);

% yellow lines

draw[<-, yellow] (rt1.150) -- ++(150:4mm) -| (upLeft) -| (square1);

draw[<-, yellow] (rt2.150) -- ++(150:4mm) -| (upLeft);

draw[<-, yellow] (rt3.150) -- ++(150:4mm) -| (upLeft);

% blue lines

draw[->, blue] (rt1) edge (square1)

                (rt2) edge (square1)

                (rt3)  to  (square1);

% red lines

draw[->, red] (square2) |- (rt1);

draw[->, red] (square2) |- (rt2);

draw[->, red] (square2) |- (rt3);

    end{tikzpicture}

end{document}

• if you write to standalone document class option tikz, than it will load tikz package, so you not need to load it again


• don't use commands like sf, bf etc, in modern LaTeX they are replaced with itshape, bfseries etc,


• it is sensible to define common style features for all nodes, for example with name base and in it define, (in your case) draw, font, minimum size
  


• for simple dotted lines you don't need decoration.shapes library ...