Welcome email flow is behaving erratically!

I’ve set up a welcome email flow. It has a total of 3 emails. The list to which the sign-up form is connected has a double opt-in.

Here’s what it looks like:

Sign up form (10% discount code)

    - User enters email id in this form in exchange for the 10% discount code

Once the user confirms their subscription they’re entered into the list connected with the sign-up form

The welcome flow:-

1. Trigger (When someone is added to a list)
2. First email: Welcome email (With a 10% discount code)
3. Time delay (I set it at 2 mins to test out the flow)
4. Conditional split (If someone has not ordered in 30 days)
5. If Yes (Receives an email with a discount code + Brand story) - Second Email
6. If No (Receives an email with just Brand story and no discount code) - Second Email
7. Last email: Contains Customer testimonials
8. Flow ends

Here are the issues I’m facing:

1. The time delay is not working correctly. Sometimes I’m getting a 10 min delay instead of a 2 min delay that I’ve set.
2. The entire flow worked correctly twice but each of those times the emails were sent in random order to the recipient. The last email was sent second, the first email was sent last and the second email was sent first. Don’t know why this is happening.

Funny thing is the status under the analytics is showing as ‘delivered’ and which in fact is true. The emails were delivered but in random order.

Please help me solve this irritating problem.