Drawing tool and chart bug in GBPUSD

Thanks for your time. As the title says, first case. There is a phenomenon that the channel line disappears. The condition is as shown in the video. It appears when zoomed out, but disappears when zoomed in. Also, depending on where it is displayed, it disappears. this red channel also disappears on M15.

Also, the usual M5 chart bug is happening again.
It seems to be happening when I start the project. It always seems to be a bug in the charts after previously saved. Could you please take care of this as soon as possible?

Please note that I am using Chrome, and reloading, F5, and other countermeasures did not work.