why did metatrader delete my orders
metatrader after a few hours deletes my pending orders , why it happens, how to fix it
Check the code of your advisor - perhaps your advisor sets the life time of a pending order.
I found this, but it is difficult to understand, those are supposed to be the advisors. What would be the property to change so that my orders are not deleted after time?
I found this, but it is difficult to understand, those are supposed to be the advisors. What would be the property to change so that my orders are not deleted after time?
You must decide which Expert Advisor will place pending orders. You must determine this yourself.
Sometimes it is useful to look in the "Trade" window in the "Magic" column:

metatrader after a few hours deletes my pending orders, why it happens, how to fix it
Price your pending order is out of slippage range