Why did my data points shift position?

Question

Here is an example of my issue:

There are two point layers displayed in this image:
The yellow dots are my currently used layer with the most updated data.
The green dots are legacy data from when the points were originally collected.

The green dot positions are accurate.
As you can see, the yellow ones have shifted south-west by a considerable amount.

The yellow positions are from a Geodatabase I have created, amassing all of the data into one spot.
The green positions are from an original shapefile before being appended to the Geodatabase.

Both layers have the same information under "Source":
EDIT: Within the data frame, they have the same coordinate system. But from the Catalog properties, they are different

• Projected Coordinate System: NAD 1983 StatePlane Oklahoma North FIPS 3501 Feet
• Projection: Lambert Conformal Conic
• Yellow Geographic Coordinate System: GCS North American 1983
• Green Geographic Coordinate System: WGS 1984 UTM Zone 10N
• Datum: D North American 1983

The offset seems to be pretty consistent across all of the data points.
Does anyone have an idea of how this happened to my data?
(Highly likely that it was user-error on my part, but I need to know how to reverse this mess I have made)

Answer 1

It seems you've a problem with the coordinate system. Now you've the same CS for both layers but probably one of them has the wrong one. You should try to check this first, then, if this is the error, you need to define the right projection before reproject for the system you want.

If this is not the error, as the shift position is consistent, you can fix it in editing mode. You should select all the yellow points and then, with the snapping on, you move one yellow point (if they are all selected they will all move) for the correspondent green point. This way you will fix the problem.