Don’t let your pots sit in the run off as it sounds like that is what’s happening. Put something in the pot saucer to hold the pot up out of the runoff of its pretty much sitting in a muddy soil. I water to runoff, let it drain for a minute and dump the runoff but the pot will still drain after so you need to keep the medium away from that and let it continue draining.
Also, if you are only getting a little bit of runoff then you need to water a larger volume to rinse it through and avoid nute buildup, all the more reason to keep the pots out of the run off.
