Congrats mate, if you will just have bet huge amount of money, the returns will be big. However, it might be a totally different outcome who knows. Same for me though, when I used small bets with great odds, most of the time it will hit. But me thinking if I made a significant bet.
it has become a natural thing and a few days ago I had an experience like this when I bet on multi bets under $10 I always won but when I felt confident betting more than $10 I actually lost and maybe this is what is called lucky or unlucky
I fully support the OP when betting using multi bets at any odds, it would be better to always use small amounts and dont expect to win but always bet casually it will be better.