It has previously come to my attention that there is a bubble column bug. Basically, any flowing water coming from a bubbly source will stop on the first block that it flows on.
I really want this fixing because it is a pain to make storage systems and it has been around for about a year.
I don't know if anyone has made a bug report on this already if so sorry.
See picture for more info.
P.S This bug applies to all version up and till 1.13
Thank you for your report!
We're actually already tracking this issue at MCPE-36463, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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