Huge symbology sizing

[JessicaTracy]

I'm having a weird issue with symbology in ArcMap. I need to size lines and points to 200 - 300 pts minimum just to see it on my map. Anyone have any clue what's going on? 

I'm relatively new to ArcMap, but I'm working from a file someone else started. 

Thanks!

[MichaelVolz]

Can you provide screenshots of original size of the lines and points that were hard to see and larger sized lines and points that are easier to see?

[KoryKramer]

Is there a reference scale set on the data frame?

http://desktop.arcgis.com/en/arcmap/latest/map/working-with-arcmap/working-with-data-frame-reference...