It's not as straightforward as putting the metrics (or dimensions) in a freeform table vs a fallout visualisation and expecting the numbers to match.
I created a simple 2-step Visitor-based fallout from my data, then built a segment from the 2nd step's green area, i.e. proportion of visitors who had moved from page A to page B. This was the resulting segment:

Notice the "THEN" operator. So AA is actually using sequential segments for its fallout visualisation, which implies that it's only reporting on visitors who were at page A and then went on to page B.
On the other hand, a freeform table would simply report the number of visitors at page A and the number of visitors at page B. And for page B, it would report on visitors who had not been to page A prior to going to page B.
So the sequence is key.