So just now I was going to test one pattern out of the 2 I had to test this week but when I entered to the testing button it showed from every pattern like 10 or more like I had lots pattern from the same kind so after like 30 sec of looking at it like 
all the patterns disappear without me doing something
But sadly I forgot to take pics
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I’ve never imported a pattern before, but I suggest moving this topic to Support 
The same thing happen me actually! And I was smart and took a photo
hold on gotta find it within all 2000 of my photos
Great I deleted it or something
Well, I had three, and the patterns all multiplied so it looked like i was testing them twice or something 
yep, this happened to me as well occasionally-they all double. this is a glitch, but if you refresh the screen or close and reopen the app it should be fixed!
if this post or another reply from this topic helped, be sure to mark it with the solution button :)