#REF! error appears after deleting a row

Hi,
I am getting a sinking feeling that my problem is just how Excel works!?

Attached is a sample of a worksheet in an app that I developed to track and report van ridership usage. After a lot of hours of time effort the form/app works just great!! Except for one detail: if, for whatever reason, a user may discover that one entry needs to be deleted. When he/she uses either the built-in "form" or right clicks and deletes using the rows index column a #REF! appears in certain cells in the row immediately following the deleted row. No subsequent rows develop this error.

The attached workbook has 3 worksheets.
Sheet1 shows the table with 6 rows of data.
Sheet2 is just for a quick way to view the underlying functions and values.
Sheet3 shows the two "#REF!" errors at cells H4 and K4. These appeared after deleting the row with ID: 1002. I kind of understand why it happened i.e. the reference to Cell G3 was momentarily lost!? But note that the row with ID 1004 does not have these errors. In other words their references updated correctly.

What should I do?
Should I create a custom lookup form with deleting capabilities to handle this problem? Or should I rethink my approach and key in on something else? Or??