Updated data not being affected by formula

Hi, I hope this is fairly easy to follow.
I've got an INDEX-ROW formula that searches through a sheet of data to match for a company name, lets say in sheet 2 column 1. Once a match is found in sheet 2 column 1 (often several matches for the same company repeated with new data) the formula copies the data for that match. The copied data from all the matches in sheet 2 column 1 are placed into a new sheet, sheet 1 Column 3. The sheet of data is updated every month. However I'm finding an issue when updating my data. The existing company names are working properly, meaning the NEW monthly data for existing companies is being returned properly as I update. However, any NEW companies that are added to the sheet, when I search for that company through the formula, it isn't returning any data, as if it's not finding any matches.

Also, all of the data for the sheet is copied and pasted in. For some reason, although the NEW companies are not returning data when they are pasted in, if I delete the NEW company name, and re-type it exactly the same, it then returns the data properly.

Any ideas? Here is my formula:

=INDEX(Table4[Item Required Proper], SMALL(IF('E-mail Sheet'!$A$26='Line Ticklers by Responsibility'!$A$2:$A$1500, ROW('Line Ticklers by Responsibility'!$A$2:$A$1500)-ROW('Line Ticklers by Responsibility'!$A$2)+1), ROW(1:1)))