I use battle tent a lot and i have noticed a glitch many times now, so i'll just post it.
I noticed that sometimes this occurs during the middle of the battle
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Sometimes before this page comes this also occurs
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and some times the page that your action was less than a second also comes before this and i am sure more than 1 second has already passed.

Also i am sure that none among the following occurred

"Maybe because; battle already ended, changed party pokemon, changed equipped items,
changed moves, used an item outside battle, or evolved a pokemon."

It is sometimes a pain because it sometimes occur just before i win like when the last opponent is weak.

It just happens. It happens when if battle already ended, changed party pokemon, changed equipped items,
changed moves, used an item outside battle, or evolved a pokemon.

i am sure that none of the above happens. This is starting to happen more frequently for me nowadays. I hope that some staff member fixes this glitch cause it is very irritating.

bumping this thread since it has reached page 2

I've noticed this happen every once in awhile in the battle tent, too.