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When reaching for the yellow or red balls (.....) your hand can actually recognize the texture a bit differently if you had just picked the yellow one and you grip it again. It's not anything major, but there could be slight indentations on the ball, or you can be picking the general area you thought the ball landed when you put it back in the bag (or whatever you used.
Now, if you closed you eyes, threw the ball into the bag, shook the bag, and then pick a ball very fast (by not shuffling your hand around in the bag), you probably wouldn't have picked the yellow one that many times.
Your 50/50 is too small of a sample. You'd need thousands and thousands of coin flips to measure it out.
Although I did just flip a coin 20 times, and after changing the height, speed and location of where I caught it I got 19 tails in a row and 1 heads at the end. (in before sample size lol).
(It's also random chance, or variance)
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