Found the issue, it's an log message not removed from TubeStuff.
./mods/immibis/tubestuff/TileCraftingTable.java
280: private void slotChanging(int var1)
281 {
282 if (var1 == 0)
...
292 this.invChanged = true;
293 this.insufficientInput = false;
294: System.out.println("slotChanging(" + var1 + ")");
295 }