Although I agree with Wilsonn that the queried term is normally translated as "non-conformities" (UK) or "nonconformities" (US), I'm not sure it's the right register here as this seems to be aimed at the consumer. I therefore think the language should probably be less technical.

In quality management, a nonconformity (sometimes referred to as a defect) is a deviation from a specification, a standard, or an expectation.
https://en.wikipedia.org/wiki/Nonconformity_(quality)


--------------------------------------------------
Note added at 24 days (2019-12-18 04:54:32 GMT) Post-grading
--------------------------------------------------

Coincidentally, while looking at translation options for the word "observación", I came across this useful reference:

Nonconformity, Nonconformance, Defect, Finding, or Observation?

Nonconformity

Are you using the right term? What do you call it when a requirement is not met?

ISO 9000:2000 3.6.2 defines the non-fulfillment of a requirement as a “nonconformity”. As expected, “conformity” is defined in 3.6.1 as the fulfillment of a requirement.

Some auditors use “conformance” and “nonconformance”. Does it really matter? ISO 9000:2000 3.6.1 states that although conformance is synonymous with conformity, it is deprecated. What does that mean? Well, “deprecated” refers to a term that is considered obsolete and being phased out. That being the case, it is preferable to use the terms Conformity and Nonconformity.

Defect

If the nonconformity relates to the intended or specified use of the product, the correct term becomes “defect”. ISO 9000:2000 3.6.3 cautions that using the term “defect” has legal connotations and should be used with extreme caution.
https://www.whittingtonassociates.com/2001/11/nonconformity-...

Although the reference above urges extreme caution when using the word "defect", I'm convinced it's an appropriate translation in this particular case, given that it relates to products and usage.