So if you set your scanner BCT15X to just scan its "channels" and its including the HAM Radio Service Search, or some other service or custom search range, what appears to have happened is that "Search with Scan" is enabled.
Check this out:
Press Menu
Scroll to Search for...
Press Func
Scroll to Edit Service
Press Func
Scroll to HAM Radio
Press Func
Scroll to Search with Scan
Press Func
Scroll to Set Lockout
Press Func
Scroll to Lockout
Press Func
This will remove HAM Radio from your normal scanning lineup.
Note that temporary lockouts will be opened back up upon power cycle, so you want Lockout.
Good luck
This manual is very useful for learning the scanner functions or getting yourself out of trouble when you accidently set something up.
Easier to Read BCT15-X Scanner Manual
Note that Ron's solution above is correct for a real time fix, my solution is a menu based one that will work regardless of if the scanner is currently in the ham band.