Can anyone tell me why this is happened and how to stop it.
Itās due to rests being hidden. Did you hide them intentionally?
If you did, I find itās easier to select them and then Custom Scale to 1% - this way they are effectively hidden but still there.
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You canāt even select these measures. Also this measures are blank.
Go to measure 70, click on the last note in the measure. In the properties panel make sure āends voiceā is not selected. That usually takes care of it.
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Thanks all. Not sure why anyone would want this behavior? Dorico is great but, like any program, has some very weird quirks.
The rests are not just hidden, they must have been removed, probably by invoking Remove Rests from the Edit menu.
This command is quite useful if there are more voices in a staff (like in lots of keyboard music), and you donāt want to see all rests in secondary voices all the time.
Technically, Remove Rests sets the property āEnds voiceā and/or āStarts voiceā for surrounding notes in the voices you selected the rests from. So thatās also how you can get those rests back again.
If you remove rests for the only voice in a staff, the gaps become totally empty, so Dorico will have nothing left to draw there, and squeezes the barlines together.
Apart from workarounds, like making the rests merely invisible by making them white, transparant or vanishingly small, there is a setting (I think in Layout Options, canāt look it up right now), to suppress the display of whole-bar rests, a setting apparently often used in film scores.
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Gets everybody the first time! 
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This isnāt a quirk of Dorico. Respectfully, it is the direct result of a (misunderstood) user command.
As alluded to above, the remove rests command is very powerful (one of my absolute favorite features, in fact!) but if you use it without understanding what will happen, it can cause funny results. Perfectly predictable results, mind you, but confusing if you donāt fully grasp what the command does or how it does it.
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This reply it totally wrong, in my opinion. No one I know, would want this to happen in a chart. I did invoke end voice, in fact I donāt know how to do it.
No one wants a car to crash, either, but if you yank the steering wheel hard right, youāll end up in a ditch.
Iām not trying to be a jerk. This is a good function of Dorico, but it is a manual intervention. It does exactly what you tell it to do. That can be good, or terrible, depending on the circumstances.
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