First, the only things you should enter under
Expense Claims are company expenses you paid for with personal funds instead of from a company bank or cash account.
When you enter them, you do so as a positive number. Manager knows, because
Expense Claims is a liability account, to treat the amount as a credit. When you look at the
Expense Claims register, you should see only positive amounts for the payments. Negative amounts should only show for reimbursements or transfers to equity.
If expenses like rent and software are showing as both positive and negative, that means you entered the negative ones incorrectly. Go back to those transactions and figure out why. You probably put them in as negative.
In double-entry accounting it is better not to think in terms of positive and negative, but to get familiar with debits and credits and understand which is applied, depending on the category of account (asset, liability, equity, income, or expense).