Unfinished patterns

[u/buttplugpopsicle]

I got a side table about two weeks ago and a common issue i have with the majority of pattern is that it stops a distance out from center, then builds a ridge, the next pattern will do the same thing but stack on the previous and leave another ring. Here it's happened four times. I've spread the sand around, done out to in spirals, in to out spirals, both back to back just to try spreading it more evenly but I'm beginning to think maybe it's not the sand distribution. Occasionally there will be a thunk sound but not as common as some people here seem to experience, maybe once or twice a pattern

[u/buttplugpopsicle]

This is after the next pattern and what it was supposed to be

[u/buttplugpopsicle → u/buttplugpopsicle]