Form madness maybe OT

I've tried about everything and have analyzed every bit of code but I can't seem to resolve this issue. It might be off topic since I can't say for sure if this is a php problem. The issue - I have a multi page form. One page seems to throw a wrench in the whole process every time I make a simple modification. Initially I had this setup: <td><input name="skill[]" type="text" id="skill[]"></td> <select name="sky[]" id="sky[]"> <select name="slu[]" id="slu[]"> <td><input name="cert[]" type="text" id="cert[]"></td> <select name="cky[]" id="cky[]"> <select name="clu[]" id="clu[]"> There were 5 rounds of these. Now when I setup the array I only set it up to grab the skill[], sky[], and slu[] And all that works great ! And so basically cert[],cky[],clu[] were just dead elements. Now what I've done is dropped the cert,cky,clu elements and added 5 more sets of the skill, sky and slu. No difference in the sequence of elements in the form. Yet for some unknown reason it throws a curve to the process somehow and basically kills the transaction. I've checked, rechecked the session start and the authentication procedures. Like I say if I put the original one back in all is well. The array does not limit the number of elements. Very strange behaviour. I am not sure what to do. After a good amount of effort I thought to post in case someone with more experience might understand the possible issues. Thank you. Stuart