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Are you running some autofilling or autoconnecting settings ON?
If so turn them off
Please don't tell me to reset the perimeter ram all you professional customer service trolls looking to get MVP status on this site.
I usually find that insulting people is not the best way to ask them for help. However..
When using the brush tool the line is the leash used for the brush smoothing options introduced in CC2018
You can turn smoothing from 0% to 100% in the options bar and also choose how the catch up at then of drawing a line works in the drop down menu
You can also turn of the visibility of the leash in Preferences although you will still see the line lag with smoothing above 0%
All that said I have never seen the smoothing options when using the clone stamp or healing brush so if you are seeing that leash on those tools, as opposed to the normal brush then I would start by resetting those tools
If that does not work then you may well have to do a preference reset. Preferences are written every time Photoshop closes and can become corrupt. Updating and re-installing does not necessarily correct those corrupt preferences (running the CC cleaner tool does). I tend to do a preference reset whenever I install a new update and occasionally as a step in the debugging process if I suspect there is a bug.
If none of the above work please post your system info from Photoshop > System Info > Copy