It sounds like your Armory might have been configured to use a different type of "Change" address...
What are your settings under: "File -> Settings -> Fee and Address Types":
Is it set to "Auto Change" or is "Force a script type" set? If "Force Type", what is the "type" that it is set to?
"Auto" will create change outputs that will try to match the recipient type in an effort to increase privacy (it makes it harder to determine what the change output is)... so it's possible that while your "receive" address types were "Legacy", your change outputs were going to "Nested SegWit" addresses.
Goto "Wallet Properties"... and check the listings for your "Change Addresses"... it will show you exactly which addresses your change outputs are in:
What are your settings under: "File -> Settings -> Fee and Address Types":
Is it set to "Auto Change" or is "Force a script type" set? If "Force Type", what is the "type" that it is set to?
"Auto" will create change outputs that will try to match the recipient type in an effort to increase privacy (it makes it harder to determine what the change output is)... so it's possible that while your "receive" address types were "Legacy", your change outputs were going to "Nested SegWit" addresses.
Goto "Wallet Properties"... and check the listings for your "Change Addresses"... it will show you exactly which addresses your change outputs are in: