Can anyone suggest why I am getting these filter false matches?

Without the OR, the filter works fine - no matches as expected.
Thanks.
Can anyone suggest why I am getting these filter false matches?

Without the OR, the filter works fine - no matches as expected.
Thanks.
I believe a bare string filter is similar to (maybe equivalent of)
So
xxxxxx OR yyyyyy
would be the same as
Apparently the 'yyyyy' is being interpreted as TRUE.
You could try:
It should not be interpreted as true.
Thanks. That works.
I'll report the apparent bug in Bug Reports.