Yep it's probably because the few models that are producing precip are only producing amounts below 1mm for the most part. Above are the accumulating rainfall scenarios from a number of models for Narangba. As you can see, a few of the models are going for a bit of precip at some stage up to 10pm Tue but most of those are below 1mm and the majority of those models aren't producing anything.
Also above is the Bureau's chance of any rainfall map (0.2mm or higher) for Tuesday which is the end result of raw model data with manual adjustments where deemed necessary.

In any case, it's pretty academic though. Even if any showers or storms form on Tuesday, most of those would be low-rainfall ones so definitely not something to pin hopes on if you're wanting any worthwhile rain amounts.