Good day! Please check the following to isolate the issue.
Check if there is excessive sampling configured on any interface. Configuring sampling can have significant impact on the flow creation. We do not recommend excessive sampling i.e greater than 1/1000 packet. The smaller the sample rate, the bigger the impact. It is recommended to not use a sampling input rate of 1. For example, if you configure a rate of 10, on average every tenth packet (1 packet out of 10) is sampled but we would recommend to configure a rate of 100.
However, if configured, with the current rate there is no export packet failures. This behaviour should be normal
Also, there is a KB which you might want to have a look at.