Resizer problem

https://snippet.dhtmlx.com/0zzm4pgg
It works fine on the snippet.
But my project has the same problem as the picture below.
(* It was drawn arbitrarily for questioning.)

Unlike snippets, resizers form in unintended places.
Is there a way to get rid of the resizer?

Is this because my dhtmlx version is not up to date?!

Please, try to update your dhx.Suite version.
If the problem still occurs for you after the update, please, provide a complete demo or a demo link, where the problem can be reconstructed.