Excel Filter() Function Skipping Data

Hello all! 

I am completing an analysis based on a very large master data set (around 50.,000 rows). I have encountered an issue in one specific calculation I am trying to program. Basically, a part of my algorithm for this calculation is using the Filter() function to find specific values based on an ID and two other criteria. However, I noticed that many expected values for a test cell with the formula were missing (e.g., I expected a dozen rows to return for this test cell but only 5 or so results would appear. I managed to find a very specific test example with a small subset of the data I have that gives the same error: 

Formula is: =FILTER(DB!W$18844:W$18850;DB!H$18844:H$18850=A2;0), A2 is 102158

Data pulled directly from my report (apologies, I use the French Canadian version of Excel which uses commas and not periods for decimals): 

This results in only row 18844 and 18848 being pulled by the Filter function, giving 2232,1 and 0

I have checked the "Evaluate Formula" tool and it successfully matches the ID number (column H) to all 7 rows as it gives the array {TRUE; TRUE; TRUE; TRUE; TRUE; TRUE; TRUE} at the step where it compares A2 to the range provided and it does not provide any further calculation steps after this. I have no idea what to check next to find the source of the error. Any ideas? 

Thanks!