this may explain it more.
also found this in the manual
Residual water trickle in the ceramic
bowls: Due to the integrated rim of the
models 310, 311, 320, and 321 toilets,
water may continue to trickle into the
toilet bowl for up to 20 minutes after
flushing. If the water trickle continues
after 30 minutes, replace the water valve.
Refer to “Replacing the Water Valve” on
page 14.
hope this helps
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