It is more than odd and it will only serve to steer more voters to the Sweden Democrats (SD).

For those not totally in tune with Swedish politics, the current government (S - social democrats - and MP - Miljöpartiet, 'environmental party') more or less stumbled right out of the starting blocks as the opposition voted down their budget. This would normally have ended with a resignation followed by a new formation attempt or new elections but this did not happen, the reason being the 'threat' of SD getting in a position of power. At that moment SD had the support of around 13% of those Swedish voters who actually turned up to vote. The opposition - which had just voted down the budget - now supported S and MP staying in power, enacting the budget proposed by the opposition. This became known as the 'decemberöverenskommelse' (December agreement).

Of course the ruling parties - S and MP, both left-wing - did not try to implement the budget as the opposition intended, they more or less went their own way. Already marred by a few scandals - e.g. the forced resignation of the minister for housing (MP) when his rather tight connections to the Erdogan-regime in Turkey, his mingling with the 'Grey Wolves' [1] (a Turkish ultra-nationalist organisation) and his connections to the Muslim Brotherhood became clear even to those who tried their best not to notice - the government stumbled along without any clear plan or direction. While they produce a lot of hollow rhetoric about their 'ethic values' (the Swedish concept of "värdegrund", [2]) and boast about being the "first feminist government" they have not acted decisively on real issues cropping up in the country, often going so far as to deny the issues. This has led to comparisons with the infamous Iraqi minister for Information, Muhammad Saeed al-Sahhaf [3] who was known for stating things as he wanted them to be instead of the way they were, even when confronted with irrefutable evidence.

All this served to push more and more people towards SD, the social stigma of being associated with this party notwithstanding. If the "opposition" - quotes around the word as it is no longer clear whether the parties of the "alliance" can be considered to oppose the current government as they did support its rule under the December agreement - does go along with S and possibly MP (which by now has lost enough support to end up under the 4% threshold) they will lose even more voters to SD. In the latest poll by Sentio the combined support for the current government parties was 26.2% while SD got 26.8%, in other words there is more support for SD in Sweden than for the coalition of S and MP. The trend has been for support for SD to roughly double every four years (the election period in Sweden), from 3% to 6% to 13% to now 26%. It is unlikely for this trend to hold but it is certainly possible for them to end up with about a third of the votes in the country. Disenfranchising these voters will have a disastrous effect on the trust in politics and politicians in Sweden, a trust which is already at bottom level.

[1] https://en.wikipedia.org/wiki/Grey_Wolves_(organization)

[2] https://en.wikipedia.org/wiki/V%C3%A4rdegrund

[3] https://en.wikipedia.org/wiki/Muhammad_Saeed_al-Sahhaf