it's impossible to swim against the flow in MCPE unlike the PC version !
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probably...but this bug isn't fixed yet and on pc version you can up on water source ! on mcpe you swim too slowly and you are drowned very quickly !
It's like real life gravity: You can swim normally in still water, but it's harder to swim up in water that is moving down. So, it technically works as intended.
Try swimming sideways... I'm pretty sure this is a duplicate, see if you can find an existing ticket about this.