Dechrau is both a noun and a verb-noun. It can mean 'to begin/start', 'starting/beginning', 'a start' or 'a beginning', for example. It is important to realise that in Welsh a verb-noun can act as all of: a verbal noun (beginning); the equivalent of an English infinitive (to begin); and a noun (a beginning). Also, some verb-nouns are spelt in the same way as their related nouns.
There is nothing that we can do as a team to fix audio errors. The audio is automatically generated by the Ivona TTS software, developed by a company now managed as part of the Amazon organisation. Remember, too, that some apparent errors may be due to people's own equipment and network connections.