Problem with arrow tips drawn twice in tikz

I'm trying to draw a simple graph with arrows. But when I compile my file, latex draws 2 tips, one at the beginning of the arrow, the other at the end, like so:

here is the code I used :

\documentclass{article}

\usepackage{tikz,pgf}
\usetikzlibrary{calc,tikzmark,shapes,decorations.pathmorphing,decorations.pathreplacing,decorations.text,decorations,shapes.symbols,arrows,positioning}

\begin{document}
\begin{tikzpicture}
\node (heure) {Heures};
\node[right=2cm of heure] (minute) {Minutes};
\node[right=2cm of minute] (seconde) {Secondes};
\draw[-stealth] (heure.north) edge[bend left] node[midway,above] {\times 60} (minute.north);
\draw[-stealth] (minute.north) edge[bend left] node[midway,above] {\times 60} (seconde.north);
\path[-stealth] (minute.south) edge[bend left] node[midway,below] {\times 60} (heure.south);
\draw[-stealth] (seconde.south) edge[bend left] node[midway,below] {\times 60} (minute.south);
\end{tikzpicture}
\end{document}

Compiled with lualatex on texlive2016. Can someone tell me what the problem is? Thanks

The main problem is that you are using edge instead of to. edge creates an extra path. In addition your labels should be in math mode, and it would help to shorten a couple of the arrows. I have removed unnecessary libraries for this example, but the code also works with all the libraries you use.

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}

\begin{tikzpicture}
\node (heure) {Heures};
\node[right=2cm of heure] (minute) {Minutes};
\node[right=2cm of minute] (seconde) {Secondes};
\draw[-stealth,shorten >= 2pt] (heure.north) to[bend left] node[midway,above] {$\times 60$} (minute.north);
\draw[-stealth] (minute.north) to[bend left] node[midway,above] {$\times 60$} (seconde.north);
\draw[-stealth] (minute.south) to[bend left] node[midway,below] {$\times 60$} (heure.south);
\draw[-stealth,shorten >= 2pt] (seconde.south) to[bend left] node[midway,below] {$\times 60$} (minute.south);
\end{tikzpicture}

\end{document}

Ok, solved the problem by changing the draw command to the path command. If someone can explain the difference between those 2, it would be super appreciated, thanks

• Good that you found a workaround. This is probably better as a remark at the end of your original question given that you have now changed what you are asking. – Andrew Aug 8 '16 at 10:28

One more solution:

\documentclass[tikz, border=3mm]{standalone}
\usetikzlibrary{positioning, quotes}

\begin{document}
\begin{tikzpicture}
\node (heure) {Heures};
\node[right=2cm of heure]   (minute)    {Minutes};
\node[right=2cm of minute]  (seconde)   {Secondes};
%
\draw[-stealth,shorten >=1mm, shorten <=1mm]
(heure.north)   edge [bend left,"$\times 60$"] (minute.north)
(minute.north)  edge [bend left,"$\times 60$"] (seconde.north)
(minute.south)  edge [bend left,"$\times 60$"] (heure.south)
(seconde.south)  to  [bend left,"$\times 60$"] (minute.south);
\end{tikzpicture}
\end{document}

As you can see, in last path I use to instead edge. Also is employed quotes library for writing of edge labels.