backtesting results inconsistence with optimization results

[tickwaiting]

Hi Tickstory,

happy new year to you and all members here.

i am facing issue with mt5 that is not exist with mt4. so the issue is as follows:

when i optimize instruments on long periods 4-5-6 years then run single test on same period with same modeling the results are the opposite.

now if the period 1-2 years then results are matching between backtesting and optimization. this made me confused and puzzled i have no idea what

went wrong. i googled this and found many users facing the same issue with mt5, some suggest it's spread or slippage some go further to coding or inner settings.

from your experience what's the issue and the solution for this issue as it's stopping me from proceeding with my testing process.


best wishes,
tickwaiting