Hi,
Nice to meet you! I'm Randy, an Independent Advisor.
It sounds like your mouse is getting stuck in a "pan/scroll mode,' which explains the strange pointer shapes and loss of clicking. First, check if any keys (like the middle mouse button, Ctrl, or Shift) are stuck, or if touchpad gestures are triggering it try disabling the touchpad and testing just with the USB mouse. Then, look at your mouse settings in Settings > Devices > Mouse and turn off things like "ClickLock" or special scroll features that could be causing it. Finally, test with a different mouse; if the issue disappears, the original mouse hardware likely has a faulty button that’s putting the cursor into scroll mode.
Kind regards,