You need to create a Percussion Map to associate the name of each of your drum/percussion instruments with its corresponding MIDI number.

Then you need to find or create a Percussion Layout to tell Finale which instrument goes on which line or space of your percussion staff.

What VST instrument played the drums in the program where you created the file? The MIDI numbers for the instruments should be listed in that VST instrument's manual.

I had the percussion groove create an extra staff below the percussion staff and that worked. I then dragged the new groove into the original percussion staff. For some reason the tempo still speeds up.......almost double time! 

… The tempo increases (ms. 7) when the drum groove measures begin to play …

My first guess would be that the culprit is an expression (with playback effect Tempo), where the tempo increases.

To test this assumption, use

Edit menu > Clear Selected Items…

to clear expressions.

If that step fixes the problem, then you know that you should look for an expression.

When you have found the culprit, you can remove the expression, or disable its Tempo playback effect.

I checked the expressions for that measure and also deleted them, but the tempo still remains fast. Anything else? Does the Drum Groove effect the tempo? 

… I checked the expressions for that measure and also deleted them, but the tempo still remains fast …

In that case I suspect that the culprit is in the document’s MIDI Data.

Again, use the dialog box Clear Selected Items, but this time de-select everything, then select only Tempo Changes.

I used the MIDI Tool and set the tempo. That did affect the tempo and problem solved. Still wonder what caused it though. Thank you for your help!