Map Item: Renaming a Map causing Bugs ?

The Problem: I have multiple withe " Player Markers / Arrows " on my Map.

1 Player marker belongs to me, which is moving correctly.
The other 1-2 markers are static, they dont move. I´m playing in a minecraft Realm but alone right now, so there are no other players currently and i am the only one creating Maps.

The problem occured the first time when i renamed 2 Maps at once at a anvil ( " Map #11 " into " L-1 " ). After that it showed 2 more player markers at the location where i renamed them.

As you can see in the picture, i got a green marker aswell, where all my original, unrenamed and completely untouched maps hang. Even this maps show multiple static player markers + my working player marker when i take them in my hands

So, when i rename 1 Map, all other copys and the original first one show these multiple player markers and get buggy.

You can simply reproduce it by renaming a copy of a Map.

I´ve tried to fix it, went to nether and back, also re-logged but it´s still the same. ( Going into the nether only got me a new problem, maps not updating and my marker was static, fixed with a relog. )

Is there a way to gid rid of these false static player markers on all my maps ?