The menu screen is displayed shakily from left to right

The following events are occurring.
The menu screen is displayed shakily to the left or right.
When I place the cursor on the statement and press the three-dot icon (“More”) displayed in the upper right corner, the menu screen appears, but sometimes the menu screen is blurred to the left or right.

Do you know the cause or how to deal with it?

Sorry if there is a mistake in translation.

Server configuration information:
Rocket.Chat server version: 6.12.1
Operating system: Ubuntu 20.04
DB replica set Oplog: 5.0 (featureCompatibilityVersion: { version: ‘5.0’ },)
Nodejs version: 14.19.3
MongoDB version: 5.0.28
Upgrade history:
RocketChat3.12.0 → RocketChat3.18.7 → remove nodejs12 → mongodb (4.0.23 → 4.2 → 4.4 ->) raise to 5.0.28 → RocketChat4.8.7 (install nodejs14 at the same time) → RocketChat5 .4.10→RocketChat 6.12.1
Best regards

Is this with the Rocket.Chat client or a browser?

Have you tested on open.rocket.chat ?

Sounds more like a client/graphics issue than Rocket.

This is occurring in my browser.
It does not seem to occur in open.rocket.chat.