I suspect RealBand is having trouble handling all the edit events. One way to minimize this possibility is to use the "Edit" > "Track" > "Consolidate Audio Region" command.

If a track contains separate audio events, this command consolidates the events into one big event. This command will work on the highlighted area of all selected audio tracks.

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2019 RealBand Edit - Track - Consolidate Audio Region

Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home