nuclearthinking

Почти сразу дошло до меня решение
может кому пригодится в будущем

нужно последнюю строку обернуть в Platform.runLater();

работающий метод будет выглядеть вот так

protected void calculationStart() {
        double progress = 0.0;
        String s1 = steamIdTextArea.getText();
        int accountId = Integer.parseInt(s1);
        MatchHistory history = null;
        try {
            history = api.getMatchHistory(MATCHES_AMOUNT, accountId);
        } catch (RuntimeException e) {
            System.out.println(e.getMessage());
            System.out.println("Task can't be completed");
            throw new RuntimeException("Closing ...");
        } catch (IOException e) {
            e.printStackTrace();
        }
        List<Long> matchesList = calc.matchIdList(history);
        ArrayList<MatchDetails> matchDetailses = new ArrayList<>();
        for (Long matchId : matchesList) {
            try {
                progress += 0.05;
                matchDetailses.add(api.getMatchDetails(matchId));
                final double finalProgress = progress;
                Platform.runLater(() -> progressBar.setProgress(finalProgress));
            } catch (IOException e) {
                progress += 0.05;
                final double finalProgress = progress;
                resultText.setText(e.getMessage());
                Platform.runLater(() -> progressBar.setProgress(finalProgress));
            }
        }
        List<int[]> scoreList = calc.playerScore(matchDetailses, accountId);
        double averageKDA = calc.averageKda(scoreList);
        Platform.runLater(() -> resultText.setText("Average KDA for last " + MATCHES_AMOUNT + " rating games = " + averageKDA));
    }