Account Schedules MTD and YTD same after Month 1.

MTD and YTD are identical after month one!!
Help please…! How do I stop MTD being identical to YTD after month 1. The start date is correct for Period 1. As soon as I move to period 2 (Right arrow at bottom of screen> to advance to next period…) MTD has all the same numbers as YTD from period 2 onwards. I have tried everything I know to stop this but I’m out of ideas now. I have experimented with the comparison date formula which currently has CM in line 1000 and the various options in column type field! Poor copy below… Thanks in advance Andy.

Line No. Column No. Column Header Column Type Ledger Entry Type Amount Type Formula Show Opposite Sign Comparison Date Formula Keep Comparison Period Scope Show Rounding Factor
10000 1 MTD Net Change G/L Entries Net Amount no CM Yes Always None
20000 2 Budget Balance at Date G/L Budget Entries Net Amount No Yes Always None
30000 3 Variance Formula G/L Entries Net Amount 1-2 No Yes Always None
40000 4 % Variance Formula G/L Entries Net Amount 3/1*100 No No Always None
50000 5 YTD Year to Date G/L Entries Net Amount No No Always None
60000 6 Budget Year to Date G/L Budget Entries Net Amount No No Always None
70000 7 Varaince Formula G/L Entries Net Amount 5-6 No No Always None
80000 8 % Varaince Formula G/L Entries Net Amount 7/5*100 No No Always None
90000 Net Change G/L Entries Net Amount No No Always None