Only Part of My Song is Exporting

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So I've created this brilliant orchestral arrangement and I have it ready to export, but when I export the project, it only exports the first 37 seconds of it.

The song does have some blank gaps in it; it's going to be a background music track for an animation and there's breaks for dialogue. It seems like these breaks are the cause of it since the exported track stops at the end of the first clip. However, I've made similar tracks with breaks like this before and they came out fine.

Can someone help me find and fix this problem?
Which version of lmms arena you using?
Do you have any tempo changes in the song?
My version is 1.1.3, I haven't updated in a while.

And yes, there are tempo changes, and there are also changes in time signature which is the one thing I haven't done before and may be the problem. I forgot to mention I used Musescore to create the MIDI which I used LMMS to add the realistic soundfonts and effects.

In the meantime it looks like I'll have to take the less-desired and more tedious route of splitting the clips into separate files and exporting them on their own.
The issue you're seeing should be fixed in the latest beta release, lmms-1.2.0-rc5.
https://lmms.io/download
That fixed it!
Cool, welcome to lmms! 8-)