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Bouncemarker latitude change when removing/adding it multiple times

See original GitHub issue

Environment:

leaflet map
some overlay to regroup markers
one marker should bounce
options of my marker:

marker.options.bounceOnAdd = true;
marker.options.bounceOnAddOptions = {duration: 3000, height: 150};
marker.options.zIndexOffset = 10;

When I click on the checkbox to display the overlay: the bounce marker is OK. Then I click again. The bounce marker disappears. Well. Finally I click again on the checkbox. All markers appear. But the bounce one is displayed some pixel on the top from the location where it should appear.

I just display some information, and the latitude seems to change each time I add the marker on the map. Except the first time.

By deleting this line: https://github.com/maximeh/leaflet.bouncemarker/blob/master/bouncemarker.js#L173 all seems to be OK. The bouncer is displayed well. The latitude don’t change. And I don’t notice any problem.

So I’m curious: what the goal of this line 173?

Thanks in advance for all kind of information about that 😉