Importing a tempo map and complications arising

I would like to import a tempo map from my sequencer which looks like this (note the starting time sig is 9/8, so you’re looking at tempo changes every dotted quarter):

I import that into Dorico, and it looks weird. See the screenshot below. I’m assuming tempos have been converted from their original dotted-quarter markings into quarter note markings (and they do sound right, so I assume that calculation has been done properly). But some of them are done as actual markings (e.g. m1 q=175, m4 q=183 then q=194) and others are signposts (e.g. the first blue one, q=180.5).

Why are some tempo changes indicated one way and others indicated the other way?

I’m asking because I’d ultimately like to hide ALL these tempo changes but keep them in the Dorico file (i.e. so they control playback), and then insert “traditional” tempo markings (e.g. Allegro dq=116) that are visible but not played. That way, I get a more dynamic tempo performance, but a more legible score.

I’d guess it is something to do with exactly how they are encoded in the MIDI.

You can hide all/any tempo marks very easily (make a selection, filter to select only tempo marks, change their visibility properties)

If you don’t want to see the resulting blue signposts, just remove them from the list in view>signposts

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Perhaps the logic is that any integer tempo marking is imported as visible and any non-integer as hidden?

The conversion that happened is interesting, I haven’t seen it before. I wonder if there even is a way to convert the numbers back to dotted quarter notes?