I had this problem, maybe some can relate.
Earlier, when disciplined, stop will be fixed and relatively small. ( small as in sufficient but strategically correct place )
Even then
very many times, mkt takes out stop and continues into MFE. ( very many could be my perception
)
Quick re-entry is very difficult, even with pro traders.
( now there is inconsistency in re-entry
and on the occasion you don't re-enter, the move would've been profitable )
more like Murphy's Law.
so SLs start getting wider or maybe another approach of hold till a certain time or eod etc.
These discretionary tweaks are how losses become larger and then unexpected losses creep in.