I've checked your website.
Some say clicks/gaps between tracks is an obvious sign
Others say the track has to be analysed to find out
Here is the example why you get gaps between tracks beside mp3s. Every second of CD audio has 44100 samples. One sample consist of two amplitude values for left and right channel. Problem with audio CDs is that they can't mark the begining and/or the end of tracks by sample number. They do it by sectors. One sector is 588 samples or 1/75 of the second (44100/75=588).
Burning software might burn no aligned tracks one after other and you wont hear difference. If number of samples in your tracks is not multiple of 588, your tracks will not start at the same positions as original, but you wont notice difference because it's less then 1/75 of the second.
Other thing burning software can do is aligning tracks to sectors while burning. If track is not multiple of 588 it will add silence at the track end. That is the short gap you will notice. 20-30% of Maiden bootlegs had those gaps nevertheless they were not mp3.
There is read/write offsets issue with CD/DVD recorders because of which you will not find those gaps right at the end of the track, but shifted to the next track.