Formula's Showing in Cell when Cell is Blank

[chad328]

G'day Members,

I have a sheet I use for greyhound racing that contains formula's that retrieve data from downloaded tabs on the same sheet,
When the those tabs contain no information for one reason or another, the result cell will show the formula instead of a blank cell.

I've attached an example sheet where you will see what I am referring to in the "Time Section" & the section below it

Any pointers would be much appreciated.

Regards,
Chad