Element grid is glitching in the gridder when trying to edit

[YungKafta]

Hey there!

I have set up a few pages with simple element grids and pictures and some texts in the past, nothing special really. Now I tried to change the content of the element grid but I can't get into it with a double click. Instead it only glitches around a little.
I've tried the usual: deactivating all plugins and custom code updated Laytheme and all plugins, tried different browsers (Chrome, Brave, Firefox) and deletet my cache. No change so far..
The page is pntl.finnvormann.de (I can provide login data, if that might help)

I am happy for some quick help since it's urgent for my client.
Thanks in advance <3

[arminunruh]

oh yea i saw that too. sorry about that, will work on it today

[YungKafta]

i was hoping that haha - sweet, thank you so much!

[arminunruh]

ok if you update now to 8.2.6 it should work again

[YungKafta]

working like a charm, thanks a lot!