[question] SFM point cloud inconsistent

[natowi]

FM0: sift+akaze
FM1: sift+cctag3
FM2: akaze+cctag3
I get 1200-2000 landmarks in the SFM

When changing to
FM0: sift+akaze
FM1: akaze+cctag3
FM2: sift+cctag3
I get 5000-6000 landmarks

When changing to
FM0: sift+akaze
FM1: akaze+cctag3
FM2: sift+akaze+cctag3
I get even 11.000 landmarks

However this is not very consistent (repeatable). What is the cause for the significant differences in the point cloud sizes?
Normally this varies only around a few hundred points.

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