Taiwanese politics is...complicated

I know nothing really about Taiwanese politics, but it was surprising to read last year that, due to the judiciary, the country was moving towards legalising gay marriage.  

However, a referendum on the weekend went against it (even though it would seem to be an advisory ballot only).   Why have advisory ballots if you have to constitutionally allow for something?   Seems odd:

The vote on Saturday, organised by Christian groups that make up about 5% of Taiwan’s population and advocates of the traditional Chinese family structure, contradicts a May 2017 constitutional court ruling. Justices told legislators then to make same-sex marriage legal within two years, a first for Asia, where religion and conservative governments normally keep the bans in place.

Although the ballot is advisory only, it is expected to frustrate lawmakers mindful of public opinion as they face the court deadline next year. Many legislators will stand for re-election in 2020.

“The legislature has lots of choices on how to make this court order take effect,” said referendum proponent Chen Ke, a Catholic pastor in Taiwan and an opponent of same-sex marriage.

Christian groups are small but that influential?  I guess if they align with traditional Chinese  sentiment towards family. 

But the rest of Taiwanese politics seems so complicated, too:

Taiwanese also elected candidates from the China-friendly opposition Nationalist party to a majority of mayoral and county magistrate posts, reversing the party’s losses in 2014.

China welcomed the defeat of Taiwan’s pro-independence ruling Democratic Progressive party (DPP) at the local elections, saying it showed people wanted peaceful relations with Beijing.

The vote dealt a major blow to President Tsai Ing-wen’s hopes of re-election in 2020, forcing her to quit as DPP leader as the Beijing-friendly main opposition Kuomintang (KMT) made gains in the face of China’s increasing pressure on the island.

The DPP has been left in control of only six of Taiwan’s cities and counties, compared with at least 15 for the KMT. The losses included one of its most steadfast strongholds, the southern city of Kaohsiung.

At a time of growing concern over China flexing its muscles by building island military bases in strategic positions, isn't it surprising that a "Beijing friendly" party is making a comeback in Taiwan?

I don't really understand...