i got nuBuilder running on docker with php 7.1 fmp (https://hub.docker.com/r/prooph/php/) using maria db as db. so far so good

everything i tried so far works pretty good, except for the SQL Builder. I can resize the SQL BUILDER GUI and add tables through the dropdown menu inside of it. unfortunately i cant move the added tables inside the gui - no matter if i resize the window or not and therefore not connect anything to each other. Is this a known bug ? how can i help to overcome this ?