The April update seems to have broken float in the web viewer.
All good, I think. Un-floating and re-floating the elements fixes it.
In fact, there is a bug regarding float. We are working on it.
Have you recently updated to 11.3? We think that this could be the cause.
Yes, I upgraded recently.
should be fixed now April Update released - #2 by fizfaz. Thanks for the bug report!