Signal shifted +7min , how to tune it? Thanks!

I wanna trade wif 1min and 15min signal in different period in 1 min Chart

e.g. 1st Period : 1 minute signal trade in period ( 09:30:00 to 09:44:59)
2nd Period: 15 minute signal trade in period (0945:00 to 16:29:59) by Ref(C,-15)

For 2nd Period (0945:00 to 16:29:59), the signal generate every 15 minute at 09:59:59, 10:14:59, 10:29:59, 10:44:59, .....etc

But when the first signal occur in 1st period at e.g. 09:36:59,
then the signal in 2nd period all shifted +7minutes, signal generated at 10:06:59, 10:21:59....etc

How to tune the signal generate at 09:59:59, 10:14:59, 10:29:59, 10:44:59, .....etc
Many Thanks!!!!!!!

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