Season's Statistics Panel
I have the same thing. I haven’t played in two weeks, won my first match and it showed a 10 loss streak, but my pips counted correctly. The match history showed 6 of 10 ranked matches won.
Something is definitely fishy going on. There’s also a bug with pip discrepancy, in-match panel shows a completely different picture (like it’s been reset to 0), while in out-of-match it shows the correct values.
Screenshots attached, top is in-match and bottom is out-of-match, showing different values. Might be related?