why the facebook pixel tracks all the conversion value automatically?

[Nicole3]

CUSTOM PARAMETERS SENT

content_type: product_group

content_ids: [xxxxxxxxx]

value: 12.99

content_name: Show

currency: USD

content_category: Bulbs

when I check the pixel code, I find that the pixel track the value automatically, but I don't want it ,how can I remove the value here, I just want to check the purchase value, I don't need the value of other events like view content,search etc.